Prevent "control reaches end of non-void function" warning from gcc on Mac.

Review URL: http://codereview.chromium.org/660379

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4001 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -4971,9 +4971,9 @@ static Object* Runtime_DateMakeDay(Arguments args) {
 
   if (year % 4 || (year % 100 == 0 && year % 400 != 0)) {
     return Smi::FromInt(day_from_year + day_from_month[month] + date - 1);
-  } else {
-    return Smi::FromInt(day_from_year + day_from_month_leap[month] + date - 1);
   }
+
+  return Smi::FromInt(day_from_year + day_from_month_leap[month] + date - 1);
 }